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MANUAL

RapidCrop Manual

v2.5 / macOS 13 or later

RapidCrop crops photos to a fixed ratio. Pick the ratio, place the frame, SPACE. It saves and moves to the next photo. Originals are untouched; a new file appears next to each.

1. Opening

  • ⌘O picks photos (several at once). ⇧⌘O picks a folder and reads everything in it, subfolders included. Dropping photos from the Finder onto the picture works too.
  • Any image format your Mac can open is fine (JPEG, PNG, HEIC, TIFF and so on).
  • Files whose names end in a ratio like _16x9 (ones this app made) are skipped when opening, so nothing gets cropped twice. Opening the same file twice counts once.
  • The strip on the right lists the open photos. Orange is the current one, green is saved. Click to jump.

2. Ratio

  • The menu at the top left: 16:9, 4:3, 1:1, 3:2, 2:1, 3:4, 9:16.
  • Picking one places the largest frame of that ratio in the center. The frame always keeps its ratio (no free-form crop).
  • Going back to a photo whose frame was placed under a different ratio resets its frame to the current ratio.

3. Moving the frame

  • Drag inside the frame to move it. It won't leave the photo.
  • Drag a corner square to resize. The opposite corner stays put and the ratio is kept.
  • W A S D nudge it up, left, down, right by 5 px.
  • Inside the frame you see a rule-of-thirds grid and the output size (width × height in the photo's own pixels).

4. Leveling

  • Drag the round handle just below the frame left or right to rotate the photo. Right is clockwise. Up to ±15°. While dragging, a level grid overlays the photo and the angle shows in 0.1° steps.
  • The R: slider at the top does the same.
  • The photo zooms in just enough that no empty corners appear. The saved file has none either.
  • The angle is remembered per photo.

5. Saving

  • SPACE (or the Save button, or ⌘S) saves with the current frame and moves to the next photo. On the last photo it stays.
  • Files go into the same folder as the original, named original + ratio + format, for example "photo_16x9.jpg". An existing file of that name is overwritten.
  • Format: JPEG or PNG. For JPEG, the Q: slider sets quality 50–100 (100 at start).
  • Width (W:): "auto" saves at the frame's own size in the photo's pixels. Type a number to scale to that width (16–16384 px); height follows the ratio. Press Enter to return to the photo.
  • Save All (⇧⌘S) saves every photo you haven't saved yet, each with its own frame.
  • Originals are never rewritten. Saved files carry no EXIF (shooting data).

6. All keys

SPACE
Save and next
← → ↑ ↓
Previous, next photo
W A S D
Nudge the frame 5 px up, left, down, right
⌘O / ⇧⌘O
Open photos / open a folder
⌘S / ⇧⌘S
Save / Save All
⌘Q
Quit (your progress is remembered first)

7. Resuming

  • On every save and on quit, it remembers which photo you were on, which are saved, and each frame and angle. Open photos from the same folder again and it asks "Resume the previous session?".
  • If the folder's photos changed since, it says "Can't resume session" and starts fresh.
  • Format, quality and width are not remembered (each launch starts at JPEG / 100 / auto).

8. Troubleshooting

  • A photo won't open — check that Preview on your Mac can open it. Unreadable files are skipped silently.
  • Keys do nothing — while you're typing in the W: field, keys go to the field. Press Enter or Tab to return to the photo.
  • A saved photo looks wrong — changing the ratio after placing a frame resets that frame. Check the "width × height" inside the frame before saving.
  • If it still doesn't work, or you found a bug, contact us. Your Mac model, macOS version, app version and what you did when it happened help us fix it quickly.